Carbon fiber composite plate layering defect air coupling Lamb wave ultrasonic detection method based on modal decomposition imaging algorithm

A composite material board, air coupling technology, applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, complex mathematical operations, processing response signals of detection, etc., can solve problems such as secondary pollution, prolong service life and avoid secondary pollution Effects of pollution problems

Active Publication Date: 2022-07-08
HARBIN INST OF TECH
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Problems solved by technology

[0004] The invention provides an air-coupled Lamb wave ultrasonic detection method for delamination defects of carbon fiber composite material plates based on a mode decomposition imaging algorithm. Secondary pollution caused by test pieces

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  • Carbon fiber composite plate layering defect air coupling Lamb wave ultrasonic detection method based on modal decomposition imaging algorithm
  • Carbon fiber composite plate layering defect air coupling Lamb wave ultrasonic detection method based on modal decomposition imaging algorithm
  • Carbon fiber composite plate layering defect air coupling Lamb wave ultrasonic detection method based on modal decomposition imaging algorithm

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Embodiment Construction

[0060] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0061] An air-coupled Lamb wave ultrasonic detection method for delamination defects of carbon fiber composite material plates based on a modal decomposition imaging algorithm, the detection method comprises the following steps:

[0062] Step 1: Connect the device and debug;

[0063] Step 2: Process the signal detected based on Step 1 through modal decomposition;

[0064] Step 3: Feature extraction and analysis are performed on the instantaneous ...

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Abstract

The invention discloses an air coupling Lamb wave ultrasonic detection method for layering defects of a carbon fiber composite plate based on a modal decomposition imaging algorithm. Connecting equipment and debugging; carrying out modal decomposition processing on the detected signal; carrying out feature extraction and analysis on the instantaneous energy of the detection signal subjected to modal decomposition processing and the flawless reference signal; representing the layering defect of the carbon fiber composite material plate by taking a cross correlation coefficient of instantaneous energy of a detection signal in a scanning direction forming the same angle with the fiber direction and a defect-free reference signal as a damage index; a two-dimensional image of the damage index is obtained from A scanning data of rotary scanning through a rotary scanning defect probability imaging method, and qualitative analysis and quantitative characterization of the carbon fiber composite plate are achieved. According to the invention, accurate characterization of layering defects is realized, and the problem of secondary pollution caused by a coupling material to a to-be-detected piece in the existing detection process is solved.

Description

technical field [0001] The invention belongs to the field of ultrasonic testing, and in particular relates to an air-coupled Lamb wave ultrasonic testing method for delamination defects of carbon fiber composite material plates based on a modal decomposition imaging algorithm. Background technique [0002] Composite materials have been widely used in aerospace and other fields due to their advantages of light weight, high strength, high temperature resistance, and strong fatigue resistance. As an important new material, carbon fiber composite material plays an important role in civil and military fields with its excellent performance and low cost. During the production and use of carbon fiber composite materials, various defects and damages will inevitably occur. The main types are wrinkling, delamination and debonding, which are safety hazards. Therefore, it is of great significance and value to detect and monitor the structural health of composite materials. A large num...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/06G01N29/44G06F17/14
CPCG01N29/041G01N29/0645G01N29/44G06F17/148G01N2291/0231
Inventor 王丙泉史维佳赵勃谭久彬
Owner HARBIN INST OF TECH
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